Hi,
I have been using the Sigma 3D printer for a year now and recently its creators decided to make it opensource. Here is the link to download plastic parts and the bill of materials:
[
www.thingiverse.com]
They have given a link to my blog for assembly instructions (I was neglecting it for a while due to my busy schedule but this has given me incentive to update it (http://www.3dprinterblog.org/)
Here is the latest addition to the blog: [
www.3dprinterblog.org]